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r <br /> r. July 16, 1987 AGS Job No. 87048-1 k ; <br /> Beacon Station #675 - Lockeford, CA <br /> ! ' <br /> 3 <br /> The calculations presented in Table 1 were used to estimate the i <br /> ground water potentiometric surface across the site. The <br /> i 1�.( <br /> contours of this surface are shown on the Ground water } <br /> Potentiometric Surface Map, Plate 2A. The contours indicate a <br /> gradient of approximately 0.33 feet per 100 feet (17.6 feet per <br /> mile) and implies ground water flow predominantly toward the west .f <br /> _ I <br /> (S61W). No data regarding flow rates are available at this time. <br /> g <br /> ANALYTICAL RESULTS <br /> Twelve soil samples retrieved from :he unsaturated zone were <br /> u analyzed for total volatile hydrocarbons and hydrocarbon i <br /> constituents (benzene, ethylbenzene, toluene, and xylenes - BETX) ! <br /> using gas chromatography with flame ionization detection j <br /> (Environmental Protection Agency (EPA) Method 8020) . Four water <br /> samples were analyzed for total volatile hydrocarbons and <br /> hydrocarbon constituents using gas chromatography with photo- and <br /> E <br /> flame ionization detection (EPA Method 602) . The results of the <br /> chemical analyses are presented in Table 2 and in the Appendix of <br /> this report. <br /> 9 . <br /> ,4W11ed '''?OSystem <br /> a . <br />